Code error

Question

I'm trying to màke typing effect. But .....
https://code.sololearn.com/WPwnZ9M1jn52/?ref=app

Answer 1

Instead of your last line being:
typing();

Make it:
window.onload = function() {
typing();
}

Answer 2

Copy my code exactly and only for the last lines, not the whole program.

Answer 3

Not working, see my updated code